Double-acting door latch



Oct. 2, 1928.

c. J. HAGSTROM DOUBLE ACTING DOOR LATCH Filed May 20, 1927 141$ I .7 M:fixg IPELi: m

Patented (let. 2, 1928.

UNlTiiE v 'p I I cam. JOHN nAesrnomor G EN] cove, NEW YORK. 1

DOUBLE-ACTING noon LATCH.

I Application filed May 20, .1927. S.eria1'No.-192,823.

This invention relatesto builders hard-.

ware and has particular reference to'catches or latches for a pluralityof doors orother similar openings.

where a pair of doors are provided for passage ways from one room orspace to another,

. and one of the objects of the invention is to render it imposslble forbothof such doors to be opened at the same time, or for either door tobeopened while theother is open. In placessuch as hospitals,laboratories, or the :may not be opened or be open at" the same time.

With the foregoing and other objects in view the invention consists inthe arrangement and combination of parts hereinafter described andclaimed, and. while the invention is not restricted to the exact detailsof construction, disclosed or suggested: herein, still for the purposeof illustrating a practical embodiment thereofreference is had: totheaccompanying drawings 1n whlch like reference characters deslgnatethe same parts,

in the several views, andin which' Figure 1 is a side elevation of; apreferred embodiment of the invention, both doors be ing shown as beingheld normally, locked closed.

Fig. 2 is a similar view-showing the posi tion. of the parts with one ofthe doors open,

and with the other locked positively from being opened until thepreviously open door is returned tonorma-l locked position.

. Fig. 3'is a diagram indicating a suggestion of a pair or group ofdoorssuch as arereferred to herein.

mechanism.

It will :be understood thatthe doors maybe variously designed as totheir construction and direction or mode of operation, butea ch of thedoors carries a catch 10 which when the door is being closed has. wipingcontact at '11 with a'catch bolt 12 slidable against the force ofaspring 13 in a direction transversev to the direction of movement of thecatch-1G;

In numerous instancesv there are places end having a similar toothconnection at 28 tween the catches they are .closed.

Fig. 4 is a view of a modification of keeper The bolt 12 is providedwith a14 within which; is housed the spring 13, the spring havingabutment at one end against one end 1 of the slot'and at the otherendagainst a fixed guide pin 15 carried by atumbler or actuator 16pivoted at 17. A. strong leaf spring 18 is s anchored at 19 and 20 andexert'sa normal tendency to'keep the tail piece 16 of the tumbleragainst a sto'p or abutment 21 fixed to thecasing.

' 22 indicates amember slidable along a pair of fixed guide ways 23carried by the casing,

, the ends of which in normal position lie'ad jacent to and slightlyoverlap the path of movement of the ends 16 of thetumblers 16.

The adjacent ends 16 of; the tumblers and 22? of the keeper 22 arebeveled or' rounded so that either of theends 1.6 when iswung downwardor away from the abutment 21-may l I cause, by wiping contact with.thekeeper, the" endwise movement of the keeper along the guides 23. Theamount of overlap or eccentricity of the two ends 16 and 22 issuflicient during such movement .of one of the tumblers to cause theopposite endof the keeper22to' assume a position well beneath the end 16of the oppositetumbler as shown at 22 in Fig. 7

2,.rendering it impossible for the opposite At 24 I show a link havingone end or tooth door tobe opened untilthe keeper is restored Y i vagain to its normalv position as in Fig. 1. 1

25 fitted in a notch 26 in the keeper 22. This link is pivoted at 27adjacent toits opposite in a notch 29 of a trip bar 30 slidable parallelto. the keeper 22 in guides 31 fixedto the cars ing. The length of thebar 30 corresponds approximately to the normal space or gap be- 10. ofthe two doors when 1 Having thus set forth the mechanicalconstructionthe. mode of operation may be briefly summarized as follows:With the.

doors ,closed and held closed by thecatches as shown inFig. 1, eitherdoor may be opened by direct pull or push as, forinstance, as shown attheleft end of 2.. The, catch 10 .carriedby said door will cause, by itscooperation with the parts 11 jand12, the rock ing of the tumbler 1'6in'a clockwise movement as above described, the end 16 thereof wiping"against the end22i of the keeper causing'the enclwise bodily projectionof the keeper to the] V 'positionof Fig. 2. This movement of the:

izeepergaeting through the 15.13.111 24 causes ar no] i similar movementin the opposite direction movement of the keeper.

' is caused in this manner to lie in thepath of toswmg away from eachother around hinges the catch 10 when the open door again comes shut.The movement of thekeeper 22 in the manner just described bringing itsend 22 positively beneath the end 16 of the opposite tumbler,constitutes .a positive stop orbarrier preventing the opening of thesecond door, while the first door is open. When, however, the open dooris returned to closed position, the catch 10 thereof impinging againstthe end of the bar 30, will cause through the rocking of the link 24,-,the return to normal position of the keeper .22, making it then possiblefor either door to be opened in the regular way. It will be noted,however, .that should itbe undertaken to open both doors at the sametime, the ends of the 1 keeper will both bar the movement of the tailpieces 16 of the tumblers and render it impossible for either of thedoors to be opened at such time. When an open door is returned to closedposition, the surface 11 of its keeper 10 wi esagainst the beveled endof the bolt 12 an causes the bolt to pass outjof the way of the catch,but the spring 13 promptly returns the bolt to normal holding positionas soon as thecatch 11 passes the point thereof.

The descri tion of construction and operation of the atching mechanismfor either door will be understood as applicable to both because asshown herein the mechanismis symmetrical asto both doors.

Fig. 3 represents two doors A and Bzhinged 32 and each carrying a catch10. From what has been set forth above it will be understood that anyperson a proaching the door A for opening it towar him may do so freelyin order to enter the space C between the doors,

or pass subsequently'through the door B, provided that the door B isclosed when the person opens the door A. Likewise any person.

approaching the door B for opening-it toward him may do so freely if thedoor A is latched, but neither door can be opened when thel'other isopen.

h In the modification of Fig. 4, thetrip. bar 30J'is similar to the bar30 above described in so far as its length, location, and actuation areconcerned, but instead of having av single notch v29, it is providedwith two notches 29" inaeach of which is fitted a link or strut 24pivoted at 27, the upper endof'e'ach vof the links or strutsco-operating with the tail end 7 p swinging of the tumbler when the dooris being opened, means co-operating "with each 1690f the tumbler. Theoperation'is the same against the upper end of the strut 24* will causethe endwise movement of the bar 30,

thereby bringing the other strut into positive latching position withrespect to the opposite tumbler.

I claim 1. In a device of the class set forth, the combination with twomembers adapted to be moved as toopen position, of catch mecha nismco-operating with said members, permitting either of the members to bemoved, said catch mechanism having means actuated by.

means actuated by said actuator to lock the second member.

2. In a device of the class set forth, the combination of apair of doorsadapted to be severally opened, of catch mechanism normally holding thedoors closed to permit either of them to be openedindependently of theother, said catch mechanism including means to ositively lock a. doorfrom being" opened while the other is open, said means including aplurality of actuators, a catch on each door engaging one of saidactuators to .movethe same on openinga door, means operated by theactuator moved to lock the other actuator against movement, and means toreturn said last mentioned means to init al pos tionon closing saiddoor.

.3. In a double acting door latch, the com-.

bination of a pair of movable tumblers, akeepor acting between thetumblers and serving. 1

normally to prevent positively the movement ,of both of them at the sametime, the keeper,-

however, permitting the movement of either tumbler to the exclusion ofthe other and being movable at such time so as topositively prevent themovement of the other tumbler,

means for attachment to a pair of-doors for severallymoving thetumblers, and m'eans actuated by the last mentioned means for thepurpose of restoring the keeper to normal position when the doors areboth shut.

' '4. In, a double acting door' latch of the character set forth, thecombination of a pair of tumblers pivoted for swinging movement inspaced relation to each other, a keeper bridging the space between thetumblersand preventing normally the movement of both of them atthe sametime, but permitting the movement of either to the exclusion of theother, a spring actuated member carried by each tumbler, a member forattachment to a door and co-operating with the catch member of eachtumbler and serving to cause the tumbler to restore'its normal positionafter being moved, the catch member on the tumbler and the meanscarriedby the door cooperating to restore the catch means to normal positionwhen the door is being shut, and means actuated by the door Whileclosingtorestore the keeper to normal'position.

5. In double acting latch means for a pair of doors, the combination ofa pair of tumblers pivoted for swinging movement severally in oppositedirections and spaced from each other, a. slidable keeper bridging thespace between the tumblers, said keeper being'movable freely endWiseWhen either door is openedand the tumbler'pertaining thereto is swungaround it spivot, a trip bar slidable parallel to the keeper,a pair ofcatch v members for connection to the pair of doors j and between whichthe trip bar normally I spans the space, andmeans to cause slidablemovement of the keeper andtrip bar severally V each from the other,substantially as setforth'.

In testimony whereof I aflix my signature.

CARL JOHN HAGSTROM.

